Selection Criteria

The 12400 Series is capable of measuring and transmitting a 4-20mA signal corresponding to the level in a vessel or the interface of two liquids of different specific gravity. It provides for HART communications over the 4-20mA signal. It can also act as a level switch and single-loop process controller. The 12400 Series is an excellent choice for more severe operating environments including high temperature, high pressure and NACE service.

Key Features

• Wide process temperature range: -210 to +450°C (-350 to +850°F)
• Wide pressure range: Up to ANSI Class 2500
• SIL2 compliance in accordance with IEC 61508 (pending)
• Three built-in, explosion-proof push-buttons with a seven-language LCD display
• Two optional adjustable built-in level switches for low and high level alarms
• Optional second 4-20mA analogue output signal
• Upgradeable Flash ROM firmware
• Non-contacting, frictionless sensor offering 0.1% resolution of measurement
• Level and interface applications capable
• Independent, non-interactive zero and span adjustments
• Zero shift and/or reduced span adjustment, even with empty chamber
• Smart filtering with auto tune
• Adjustable low and high failsafe output signal
• Continuous diagnostic data with bar graphs: number of filling up, high level time, low level time, working time
• Software ambient temperature compensation
• High degree of weather protection: IP 66/67. Protected from dust, rain, snow, water jets, limited submersion and corrosive atmospheres

Benefits

• Integrated level transmitter, controller and switch functions
• Reduced installation and start-up costs with Dresser Masoneilan ValVue software or DTM
• Flexible integration system by offering maximum interoperability with HART-compatible handheld and DCS
• Highly reliable and accurate instrument using a fully field-proven technology
• Measurement of the liquid level of a fluid with unknown specific gravity
• Excellent stability: When installed inside a chamber, surface turbulence and foam do not impeded the displacer. Moreover, measurement is unaffected by process fluid agitation.
• Installation flexibility: Meets requirements of almost every installation with top, side or bottom connections and a full rotation in the horizontal plane to accomodate process structures.